1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
In an experiment to measure the density of the material of a sphere, an error of $2 \%$ occurred while measuring the radius of a sphere and an error of $3 \%$ occurred while measuring the mass of the sphere. What is the maximum percentage error in the measurement of density?
A
8
B
6
C
7
D
9
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The radius of earth is $R$ and acceleration due to gravity on its surface is $g$. The height at which the acceleration due to gravity becomes $\frac{g}{8}$ is:
A
$2 R$
B
$(2 \sqrt{2}-1) R$
C
$\sqrt{2} R$
D
$2 \sqrt{2} R$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A block of metal A is connected in series with another block of metal B such that the two metal blocks have the same area of cross sections. The thermal conductivity of metal A is K and the free end of metal A is at $80^{\circ} \mathrm{C}$. The temperature of the interface is $60^{\circ} \mathrm{C}$ and the free end of metal B is at $20^{\circ} \mathrm{C}$. Assuming the two metals have the same thickness, the conductivity of metal B is:
A
$2 K$
B
$4 K$
C
$\frac{K}{2}$
D
$\frac{K}{4}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The mean energy per molecule for a diatomic gas is:
A
$\left(\frac{5}{2}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
B
$\left(\frac{3}{2}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
C
$\left(\frac{3}{2 N}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
D
$\left(\frac{5}{2 N}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
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